P2002 DPF efficiency below threshold (bank 1)
P2002 means the engine control unit considers that the diesel particulate filter (DPF) is trapping too little soot. This often points to cracked or melted filter ceramic, but a damaged pressure pipe or sensor can trigger the same code. That is why we check those first - cleaning does not repair cracks.
Does restoration help?
Not worth restoring
If the ceramic is cracked or melted - no: cleaning removes deposits but does not repair cracks. However, a disconnected or damaged pressure pipe or sensor can trigger the same code, so we check those first. If the filter is intact, it does not need replacing.
A code shows where to look, but it is not a final diagnosis. We make the decision at the workshop after diagnostics and measurement.
Symptoms
- Check Engine or DPF light on.
- Soot at the tailpipe - the filter no longer traps it.
- The roadworthiness test measures particles on diesel cars up to 3.5 t first registered from 2013; since 2026 a car with a damaged filter fails.
Most common causes
- Cracked or melted filter ceramic.
- A disconnected, cracked or blocked pressure sensor pipe.
- A faulty differential pressure sensor.
- The filter has been removed or its housing is empty (on used cars).
Order of checks
What to do
- 1
Pipes and sensor
We check whether the pressure sensor pipes are disconnected or cracked, and we check the sensor signal.
- 2
Filter condition
We check that the filter is in place and that the ceramic has no cracks or melted areas.
- 3
New filter or replacement part
If the ceramic is damaged, we recommend a new filter or a replacement part. We do not offer filter removal - without a filter the car fails the roadworthiness test.
FAQ
Questions about P2002
If the filter ceramic is cracked or melted - no, cleaning does not repair cracks. If the fault is in a pipe or the sensor, the filter may be intact, and then it does not need replacing. We find this out during diagnostics.
Most likely not. CSDD measures particles on diesel cars up to 3.5 t first registered from 2013, and since 1 January 2026 exceeding the limit means a grade 2. With a damaged filter a car does not meet the limit.
P2002
Not sure what is wrong with your car?
Tick the symptoms or enter the fault code - in 30 seconds you get a first assessment of whether the part can be restored. If restoring is no longer worth it, we buy the old converter.
Request
Book a check or a job
Leave your contact details - we will get back to you, clarify the situation and agree on a time.
- Phone+371 29 007 007
- Phone+371 28 777 998
- WhatsApp+371 20 099 444
- Emailinfo@autokatalizatori.lv
- AddressJūrkalnes iela 62, A7 bokss, Rīga
